General > Past L-E Projects
Initial D 4th Stage comments... - Archive Topic (Locked)
Chapel:
B6 and BP are the same basic engine
both the 1.6 and 1.8 DOHC have the same 221.5mm block deck height and 134mm head height.
you can actually take a BP bottom end (block, pistons, crank, etc...) and put it on a B6 head.
This is commonly refered to as a 'bore out' even though you are just doing a short block swap.
I know alot of guys that do that with their Eunos Roadsters. You can get the 1.8L BP block from a variety of cars (90-98 Protege, 91-96 Ford Escort GT, 94+ Miata, 91-96 Mercury Tracer LTS, 94-97 Kia Sephia GS)
Most guy I know get them out of BP equipped Proteges though.
Rather than bore the hell out of alot of people here, just read this
You know the best swap I've seen. My boy Cam took his B3 engined (1.3L) Ford Festiva and transplanted a B6-T engine from a 323 GT into it :)
Festiva with rims?
Surprise! B6T!
I heard the NEW owner transplanted the full 323 GT-R driveline into that Festiva though... AWD Turbo 1.8!
mechazawa:
Chapel, I am already familure with that site. Here are a couple of quotes from the page you link to.
"The 1.6 liter version has as large a bore as the block can accommodate and cannot really have it's displacement increased much more, in fact, enlarging the bore beyond +1mm is not advised."
and
"the 1.8 is really just a stretched 1.6...has a longer bore spacing to accommodate the larger 83mm pistons."
Note that bore spacing refers to the distance between centers, not the size of the bore.
This proves my point, you can't get 1.8l out of a bp block, at least not with out building a stroker. The heads are not interchangable.
BTW: I love that Festiva!
Chapel:
so, when they are doing the 'short block swap' they are using the BP head?
I know guys who have done the 'short block swap' but I always assumed it was just the bottom end. When I did a short block swap to my Rabbit, I just swapped the old 1.8L bottom for the 2.0L bottom out of an Audi.
and the 'short block swap' for my BMW is just the bottom end from a 2.8L
mechazawa:
well, I hate that I am turning this into so much of an engine building discussion, but I guess I need to explain.
You can interchange bottom ends on a lot of engines. I have a BMW M20 mill myself so I know you can do that one. In that case, BMW increased the displacement from 2.5 to 2.7 by lengthening the stroke, it was not necesary to change the block casting. Also, if there is enough thickness to the cylinder walls in the original design you really can bore an engine out for a substantail bump in displacement.
Conversions like this are posible with lots of engines from Honda, BMW, VW, Toyota, Nissan, Volvo, Ford...and even Mazda, its just that it doesn't work with the B6.
With the B6 the stroke was already quite long, and the cylinder walls too thin to simply increase bore. So Mazda chose to cast a whole diferent block with more space betwen the bores.
Anyone who tells you that they are going to put a b6 cylinder head on a bp is full of it.
Miata owners, at least here in the US, always swap the entire engine--call it what you will.
All this complexity is why I wanted to ask about the translation.
Chapel:
more an issue with the series writers than the translation probably.
it probably translated into boring it out, even though thats not possible. I could bring F&F into the equation :D
hey, if you've got a BMW, head over to http://www.mwerks.com
Its a BMW site I help run. I'm the BMW Technical Supervisor there.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version